can build toolchain in two steps, but not one

["Robert P. J. Day" <rpjday at mindspring dot com>]

  ok, i've sort of isolated an error that's causing me grief and it
might either cause more general problems than just for my combination,
or i could just be an idiot.

  once again, trying to build sh3eb toolchain with the absolute latest
and greatest parts (including an SH-ified 2.6.13 kernel source tree).
i can build the toolchain *and* compile the kernel if i do it in
stages:

  * build the toolchain using the sanitized headers (no kernel source)
  * augment PATH to include new toolchain executables
  * export CROSS_COMPILE=sh3eb-unknown-linux-gnu-
  * configure kernel source tree with fairly generic config file
  * go to top of kernel source tree and "make ARCH=sh zImage"

the above works just fine, so we know it can be done in stages.

(SIDE NOTE:  previously, to select sh3eb, i had the following line in
the .dat file:

	TARGET_CFLAGS="-O -m3 -mb"

however, based on this excerpt from arch/sh/Makefile:

	cflags-y                                := -mb
	cflags-$(CONFIG_CPU_LITTLE_ENDIAN)      := -ml
	...
	cflags-$(CONFIG_CPU_SH3)                += -m3

it appears that i can delete those two -m flags and it won't make any
difference, so i dropped them and it still worked.)

  now, since it can be done in stages, i tried to do it all at once.
i changed the crosstool config files to point at the kernel source
tree and the kernel config file.  i also (could this have been a
mistake?) unset CROSS_COMPILE and removed the crosstool bin directory
from PATH, and started the build.

  after a short while (and about 60,000 lines of output), i got the
following error:

...
+ KERNEL_PATCHLEVEL=6
+ case "$KERNEL_VERSION.$KERNEL_PATCHLEVEL.x" in
+ case $ARCH in
+ make ARCH=sh prepare include/linux/version.h
  SPLIT   include/linux/autoconf.h -> include/config/*
  CC      scripts/mod/empty.o
cc1: error: invalid option â'b'
cc1: error: invalid option â'3'
make[2]: *** [scripts/mod/empty.o] Error 1
make[1]: *** [scripts/mod] Error 2
make: *** [scripts] Error 2


  what that tells me is that the perfectly valid SH3 options -mb and
-m3 are unrecognized, which further suggests that the wrong compiler
is being used since it doesn't recognize SH3-specific options.

  what have i misunderstood here?  how are those option settings
getting in the way, because that's clearly what's happening.

  thoughts?

rday

p.s.  uh oh ... i think i have a glimmer ...

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